May or may not require an actual debug console in some cases (specifically on the Xbox), but most play on modded systems fine. Feel free to ask more questions, Ive only posted small bits of whats written on the disks. Some I have tested a bit, some I have not.
Xbox
Blink 2 : Early Preview Code - 35$
Speed Kings - Early Code - 35$
WWE WrestleMania 21 - Preview - 30$
Counter Strike - Preview Code with small paper document - 40$
Vexx - For Preview - 50$
Rocket Power Zero Gravity Zone (Unreleased) - 215$ (buy both the PS2 and Xbox version for 400 total)
Phantom Crash - Final / Debug Version - 40$
PS2
Sphinx - Review Build (Early) - 40$
Rocket Power Zero Gravity Zone (Unreleased) - 215$ (buy both the PS2 and Xbox version for 405 total)
MLB 2006 Review Disk - 20$
Indigo Prophecy - External Preview - 70$
24: The Game Pre Tech Check Build - 35$
Amplitude Review Code - 35$
Frequency (Review) (Dumped and Released) - 30$
Mat Hoffman's Pro BMX 2 (For Print) (Alpha Build) (Released I think) - 25$
Prefer Paypal via gift with fee paid, all items shipped using USPS priority mail in a box, usually flat rate regardless. Prices range from 6-14$ shipped-ish